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(!!) 5963=12AU7 RCA NOS 1963 (9.2/9.6ma)
(!!) JRC-12AU7 RCA NOS long gray plates mid-1950's "D" getter (9/11.6ma)
(!) (Best Value Single) ECC82=12AU7 Zaerix East Germany NOS 1970's (12.8/12.0ma) (same Gm)
(!!!) (Smooth Single) ECC82=12AU7 Ediswan Valve by Brimar England NOS ribbed plates large "O" getter halo 1962 (11.4/11.8ma)
(!!!) (Best pair #3) 12AU7A GE NOS 1958-1965 (10/10.6 and 10/11.6ma) (close Gm)
(!!!) (Best Single) E82CC=12AU7 Siemens NOS triple mica NOS 1967 (10.8ma/11.2ma)
(!) (Slightly microphonic) JG-5814A GE NOS triple mica "U" getter halo 1956 (10.2/10.4ma) 1-2% section balance (high Ma and Gm)
(!) (slightly microphonic single) 12AU7 Hitachi JAPAN branded IEC Mullard NOS ribbed plates 1968 (9.4/11ma)
(!!) (Good Value Single) ECC82=12AU7 Philips Miniwatt Holland used/good 1965 (7.8/10ma)
(!!) (Best Value Single 1953) 12AU7 Sylvania black plates "D" getter used/strong 1953 no printing (9.6/11.8ma)
(!) 12AU7 Tungsol gray ribbed plates NOS square or "D" getter halo 1954 in white box (8.2/8.6ma)
(!) 12AU7A Hitachi JAPAN branded Realistic Lifetime NOS ribbed plates 1960 era (9.2/12.2ma)
(!) JTL-12AU7 Tungsol narrow plates "D" getter NOS 1955 bottom mica is tilted (10.4/10.6ma)
(!!!!) (Best Single 1956) ECC82=12AU7 Siemens Halske "Long Ribbed Plates" and large/wide "U" getter branded Haltron 1956 (10/9.2ma) (k62 series) (High Gm) (rare)
(slightly microphonic tube) 12AU7 RCA tall black ribbed plates "D" getter halo tests like new 1950's (9.4/10.0ma)
(slightly microphonic tube) 12AU7A RCA tall black ribbed plates "D" getter halo used/good 1950's (8.2/8.8ma)
(slightly microphonic tube) JRC-12AU7 RCA tall black ribbed plates "D" getter halo tests like new 1950's (9.6/10.4ma)
(READ REVIEW) 12AU7=ECC82 RT Radio Technique France long plates 1958-1959 (11.6/9.8ma) (close Gm)
(!!!!!) (Best Value Mullard Pair) 12AU7=ECC82 Philips Mullard UK NOS 1966-1974 same build (10.6/10.3ma and 11.7/10.4ma) (close Gm matching) (Rogue, Hovland, Audio Note)
(!!!!!) (Best Overall Pair) ECC82=12AU7 Telefunken Diamond Bottom ribbed plates NOS 1958-1960 (9.0/10.2ma and 10/9.6ma) (Same Gm)
